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An essential tool for every tool room. One tool does two jobs in a single pass. They can be sharpened repeatedly and are easily modified for any special length of step.
For Drilling & Counterboring Cap Screw Clearance Holes
For Drilling 45° Chamfered Holes To-Be-Tapped
For Drilling and Countersinking 82° Flat Head Machine Screw Clearance Holes